Table 5. British Standard ISO Metric Precision Hexagon Nuts and Thin Nuts BS 3692:1967 (obsolescent)
Tolerance on Squareness of Thread to Face of Nut b
Thickness of Thin Nut t
Width Across Flats s
Width Across Corners e
Thickness of Normal Nut m
Eccentricity of Hexagon
Pitch of Thread (Coarse Pitch Series)
Nominal Size and Thread Diameter a d
Max. 3.20 4.00 5.00 5.50 7.00 8.00 10.00 13.00 17.00 19.00 22.00 24.00 27.00 30.00 32.00
Min.
Max. 3.70 4.60 5.80 6.40 8.10 9.20 11.50 15.00 19.60 21.90 25.4 27.7 31.20 34.60 36.90 41.60 47.3 53.1 57.70 63.50 69.30 75.10 80.80 86.60 92.40 98.10 103.90 109.70 115.50
Min. 3.48 4.38 5.51 6.08 7.74 8.87 11.05 14.38 18.90 21.10 24.49 6.75 30.14 33.53 35.72
Max. 1.30 1.60 2.00 2.40 3.20 4.00 5.00 6.50 8.00 10.00 11.00 13.00 15.00 16.00 18.00 19.00 22.00 24.00 26.00 29.00 31.00 34.00 36.00 38.00 42.00 45.00 48.00 51.00 54.00
Min. 1.05 1.35 1.75 2.15 2.90 3.70 4.70 6.14 7.64 9.64 10.57 12.57 14.57 15.57 17.57 18.48 21.48 23.48 25.48 28.48 30.38 33.38 35.38 37.38 41.38 44.38 47.38 50.26 53.26
Max. 0.05 0.06 0.08 0.09 0.11 0.13 0.17 0.22 0.29 0.32 0.37 0.41 0.46 0.51 0.54 0.61 0.70 0.78 0.85 0.94 1.03 1.11 1.20 1.29 1.37 1.46 1.55 1.63 1.72
Max. 0.14 0.14 0.14 0.14 0.18 0.18 0.18 0.22 0.22 0.27 0.27 0.27 0.27 0.33 0.33 0.33 0.33 0.33 0.39 0.39 0.39 0.39 0.39 0.39 0.46 0.46 0.46 0.46 0.46
Max.
Min.
M1.6
0.35 0.4 0.45 0.5
3.08 3.88 4.88 5.38 6.85 7.85 9.78
… … … … … … …
… … … … … … …
M2
M2.5
M3 M4 M5 M6
0.7 0.8
1
M8 M10 M12
1.25 1.5 1.75
12.73 16.73 18.67 21.67 23.67 26.67 29.67 31.61 35.38 40.38 45.38 49.38 54.26 59.26 64.26 69.26 74.26 79.26 84.13 89.13 94.13 99.13
5.0 6.0 7.0 8.0 8.0 9.0 9.0
4.70 5.70 6.64 7.64 7.64 8.64 8.64 9.64
(M14) M16 (M18) M20 (M22) M24 (M27) M30 (M33) M36 (M39) M42 (M45) M48 (M52) M56 (M60) M64 (M68)
2 2
2.5 2.5 2.5
10.0 10.0 12.0 12.0 14.0 14.0 16.0 16.0 18.0 18.0 20.0
3 3
36.00 41.00 46.00 50.00 55.00 60.00 65.00 70.00 75.00 80.00 85.00 90.00 95.00 100.00
39.98 45.63 51.28 55.80 61.31 66.96 72.61 78.26 83.91 89.56 95.07 100.72 106.37 112.02
9.64 11.57 11.57 13.57 13.57 15.57 15.57 17.57 17.57 19.48
3.5 3.5
4 4
4.5 4.5
5 5
5.5 5.5
… … … …
… … … …
6 6
a Sizes shown in parentheses are non-preferred. b As measured with the nut squareness gage described in the text and illustrated in Appendix A of the Standard and a feeler gage. All dimensions are in millimeters. For illustration of hexagon nuts and thin nuts see Table 3.
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